#include <Wire.h> 
#include "RTClib.h" 

unsigned long ms;
unsigned long ms_comp = 0;


RTC_DS1307 RTC; 
	void setup () {
		Serial.begin(115200);
	Wire.begin(); 
	RTC.begin(); 
	if (!RTC.isrunning()) {
	Serial.println("RTC is NOT running!"); 
	RTC.adjust(DateTime(F(__DATE__), F(__TIME__)));
	}
	}
	void loop () { 

		ms = millis();
  if (ms - ms_comp >= 1000) {
    showTime(); 
		ms_comp = ms;
		}
    
  }

  void showTime(){
  DateTime now = RTC.now(); 
	Serial.print(now.month(),DEC);
  Serial.print('/'); 
  Serial.print(now.day(), DEC); 
	Serial.print('/'); 
	Serial.print(now.year(), DEC); 
	Serial.print(' '); 
	Serial.print(now.hour(), DEC); 
	Serial.print(':'); 
	Serial.print(now.minute(), DEC); 
	Serial.print(':');
	Serial.print(now.second(),DEC);
	Serial.println(); 
  }